Rotary pump



A E. SH|NER ROTARY PUMP.

APPucATloN man SEPT. 14, 19,20.

Panted Sept. 13,' 1921.

3 SHEETS-SHEET L A. E. SHINER.

ROTARY PUMP.

APPLICATION FILED SEPT. I4, 1920.

Pand sept. 13,1921.

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ROTARY PUMP. APPLICATION riLEb sPT.14. |92o.

1,390,932. Patentedsept. 13,1921.

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ALBERT EDWARD SHINER, OF LONDON, ENGLAND.

ROTARY PUMP.

Specication of Letters Patent.

Patented sept. 13, 1921.

Application led September 14, 1920. Serial No. 410,251'.

To all whom 'it may concern Be it known that I, ALBERT EDWARD SHINEI?, asubject of the King of Great Britain, residing at London, England, haveinvented a new and useful Improved Rotary Pump, of which the followingis a specification.

This invention relates to an improved rotary pump of the type comprisinga cylindrical pump chamber and a cylindrical piston of smaller diametermounted therein, with its axisparallel to the axis of the pump chamber,in such -a manner that the exterior cylindrical wall of the piston is incontact with the interior wall of the ump chamber along a line parallelto the axes ofboth these members. This piston is moved by an eccentricso that the said line of contact moves progressively around thecylindrical walls of the piston and pump chamber, and a radially slidingpartition plate, opposite edges of which extend into grooves in 'thepiston and the pump chamber, re-

, spectively, is provided between inlet and outlet oriiices respectivelyleading into and out from the said pump chamber.

ow, according to this invention, the radially sliding plate isconstructed as /a cut oil' or slide valve, and the walls of the groovein which it slides form valve faces having inlet and discharge portsrespectively openin therethrough, so that these ports, under t econtrolffof the cut off valve, can be put into communication with thepump chamber on opposite sides of the said cut off valve respectively.

In the accompanying drawings Figure 1 is an end view of the improvedrotary pump with an end plate and one supporting standard removed.

Fig. 2 shows a vertical axial section of the same.

Fig. 3 is an end view -of the piston of this pump.

Fig. 4 shows a section on the line 4 4,

ig. 5 shows a section on the line 5--5, Fi 3.

ig. 6 shows a section on the line 6-6, 4. igs. 7 and 8 are respectivelyan end and a side view of the cut oif valve of the irnproved pump.

9 and 10 are detail views of the trunnions supportingl the rotary partsof the pump.

Referring to these drawings, 10 is a base plate supporting uprights orstandards 11, 12. In the standard 11 is mounted a tubular trunnion 13the bore of which acts as an inlet conduit 14, and this trunnion isformed with an exterior concentric bearing surface 15-and an exterioreccentric bearing surface 16. In the standard 12 is mounted a similartubular trunnion 17 the bore of which acts as a discharge conduit 18,land this trunnion 1s formed with concentric and eccentric bebarlngsurfaces 19, 20 respectively in axial alinement with the bearingsurfaces 15, 16. These inlet and outlet trunnions 13, 17 are heldagainst rotation in the standards 11, 12 by keys 21 or set screws 22.

The pump body 23 is formed with an interior cylindrical chamber'24closed by end plates 25 rotatably mounted on the concentric bearingsurfaces 15, 19 of the inlet and discharge trunnions. Exteriorly to thepump body and integral therewith or fixed thereto, there is rovided abelt pulley 26 or other means w ereby the pump body can be rotated aboutthe bearing surfaces l5, 19 on which the end plates 25 are mounted.

Within the pum chamber 24 is arranged a hollow piston 217 cylindricalwall and end plates 27a in which central concentric apertures are formedwhich are mounted on the eccentric bearing surfaces 19, 2O on therinletand outlet trunnions above described. The said piston is moreover formedwith an exterior groove or slideway bounded by lateral walls 28, 29. Thehollow interior of the piston 27 is divided into two compartments 30, 31sepaformed with an outerv rated by a curved or angular partition wall32, the inlet conduit 14 opening into one compartment 30 and the outletconduit leading from the other compartment 3l. Communication betweeneach ments and the pump chamber 24' can be established, under control ashereinafter described, through ports 33, 34 formed in the said lateralwalls 28, 29.

A double cut-off valve 35 is formed with a cylindrical enlargement 36along one edge thereof and this enlargement 36 is accomodated in acylindrical pocket provided in an enlargement 37 of the wall of the pumpbody. The opposite faces 38, 39 of the valve reciprocate on the faces ofthe lateral walls of these compart-I vantageous in preventing the slidevalve from getting out of alinement with thev rotation of the pump body23 the hollow piston 27 moves with it, the double cut off valve 35acting as a driving dog between these parts, and owing to the pistonbeing mounted eccentrically to the pump chamber the line of contactbetween these parts moves round the interior wall of the pump chamber ina relatively opposite direction. Owing to the manner in which motion iscommunicated from the pump body to the piston, that is to say throughthe valve, the latter is caused to oscillate slightly in the pocket 36about the axis of the pocket but this has no effect on the operation ofthe pump and is only an incident of construction.. At the same time the'valve 35 is reciprocated in the roove in a direction radial to thepiston so t at at the instant the line of contact passes across thebreak in' the pump chamber wall through which the valve projects, bothfaces of the valve 35 are entirely closed on their seats on the walls28, 29 of the groove and the pump chamber is during this period cut oi'ffrom-both the inlet and outlet chambers in the hollow piston and therecan be no regurgitation of the fluid passing through the pump. This isnot the case in constructions in which the inlet and outlet ports openthrough either the cylindrical walls or end walls of the pump chamber orpiston so that, at times, as the line of contact passes between theinlet and outlet orifices, these orifices are indirect communicationthrough the pump chamber.

In my improved pump the iuid moved along in advance of the line ofcontact, when the valvef35 opens, is expelled through the port 34 in thewall 29 into the compartment 31 within the piston and thence to thedischarge' conduit 18.

The invention has been hereinbefore described more particularly withregard to its use in a hydraulic pump but the improved construction isalso applicable to air or other pumps, moreover by reason of the specialarrangementof the cut off valve the principle of the invention can beused in theconstruction of a motor, actuated by*- steam, water, air orother fluid yunder pressure.

I claim 1. A rotary pump comprising a cylindrical pump chamber, acylindrical piston of smaller diameter mounted therein, one of saldparts provided with oppositely arranged valve faces having ports openingtherethrough and forming a slideway and one of said parts being providedwith a Aguideway, a cut olf valve slidable between said valve faces andhaving an oscillatory support in the other of the said parts, a tail rodon said cut-off valve working in said guideway, and means for moving thepiston within the pump chamber.

2. A rotary pump comprising a cylindrical pump chamber, a cylindricalpiston of smaller diameter mounted therein, one 'of said parts providedwith oppositely arranged valve faces having ports openin therethroughand forming a slideway an also provided with a guideway, a cut off`valve slidable between said valve faces and havin an oscillatorysupport in the other of the said parts, said cut-od valve having similarfaces on its opposite sides to coperate with the ported valve faces inorder simultaneously to alternately`cut off and open in equal degreescommunication between the said ports and the interior of the pumpchamber, a tail rod on said cut-off valve and means forl moving thepiston within the pump chamber.

3. A rotary pump comprising a cylindrical pump chamber, a hollowcylindrical piston of smaller diameter mounted therein,

said piston having oppositely arranged valve faces each having a portopening therethrough, said valve faces forming a slideway, said pistonalso havin a guideway, a wall within the said piston dividing itsinterior space into separate compartments with which said ortsrespectively communicate, a cut off va ve slidable between said valvefaces and provided with a rail rod working in said guldeway and havingan oscillatory support in the wall of the ump chamber, and means formoving the plston within the pump chamber.

4. A rotary pump comprising a cylindrical pump chamber, a hollowcylindrical piston of smaller diameter mounted therein, said pistonhaving oppositely disposed valve faces each having a port openingtherethrou h and provided with a guideway, Said valve aces formin aslideway, a wall within the said piston dlviding its interior space intoseparate compartments with which said ports respectively communicate,separate conduits respectively in open communication with the Isaidcompartments, a cut off valve slidable betweensaid valve faces providedwith a tail rod Working in .said guideway and having an oscillatorysupport in the wall of the pump chamber, and means for moving the pistonwithin the pump chamber.

5. A rotary pump comprising a cylindrical pump chamber, a, hollowcylindrical piston of smaller diameter mounted therein, said pistonhaving oppositely disposed valve faces having ports dpening therethroughand provided with a guideway, said valve faces formin a slideway, a wallwithin the said piston ividing its interior space into separatecompartments With which said ports respectively communicate, a cut offvalve slidably mounted in the said slideway and having faces on itsopposite sides thereof to coperate with the said orted valve facesrespectively and providedp with a tail rod working in said uideway, anoscillatory support for the said cutoff valve arranged int e Wall of thepump chamber, and means for moving the iston progressively along acircular path within the pump chamber s0 as to cause the cut olf valveto be reciprocated in the said slideway.

6. A rotary pump comprising a cylindrical pump chamber, a hollowcylindrical piston of smaller diameter mounted therein,

one of said pa'rts havinga guideway, and said piston having oppositelydisposed valve faces each having a port opening therethrough, said valvefaces forming a slideway, a wall within the said piston dividing itsinterior space into separate compartments with which said plortsrespectively communicate, trunnions aving conduits formed therethroughin openK communication respectively, with the separate compartmentswithin the piston, said trunnions being provided with axially alinedbearing surfaces on which the pump chamber is rotatably mounted and withother axially alined bearing surfaces arranged eccentrically to saidfirst-named bearing surfaces and on which the iston is rotatablymounted, and a cut off vaFve slidably mounted between the said valvefaces and having an oscillatory support in the wall of the pump chamberand provided with a tail rod working in said guideway.

7. A rotary pump comprising a cylindrical pump chamber, a hollowcylindrical piston of smaller diameter mounted therein, said pistonbeing provided with a guideway and with oppositely disposed valve faces,each of said valve faces having a port openingl therethrough and saidvalve faces together forming a slideway, a wall Within the said pistondividing its interior space into separate compartments with which saidports respectively communicate, a cut off valve slidable between saidvalve faces and having an oscillatory support in the wall ofV the pumpchamber, a tail rod on the said cut off valve extending into theguideway in the piston, and means for moving the piston within the pumpchamber.

ALBERT EDWARD SHINER.

Witnesses:

HERBERT ARTHUR BnEsToN, FREDnRIcK ARTHUR WILLIAMS.

